We calculate the arrival direction distribution of ultrahigh-energy cosmic rays (UHECRs) with a new suite of models of the Galactic magnetic field (GMF), assuming sources follow the large-scale structure of the Universe. Compared to previous GMF models, the amplitude of the dipole component of the UHECR arrival flux is significantly reduced. We find that the reduction is due to the accidentally coinciding position of the peak of the extragalactic UHECR flux and the boundary of strong flux demagnification due to the GMF toward the central region of the Galaxy. This serendipitous sensitivity of UHECR anisotropies to the GMF model will be a powerful probe of the source distribution as well as Galactic and extragalactic magnetic fields. Demagnification by the GMF also impacts the visibility of some popular source candidates.

中文翻译：

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银河磁场中超高能宇宙射线的大规模各向异性和磁通量（去）放大


我们用一套新的银河磁场 （GMF） 模型计算了超高能宇宙射线 （UHECR） 的到达方向分布，假设源遵循宇宙的大尺度结构。与以前的 GMF 模型相比，UHECR 到达磁通量的偶极子分量的振幅显著降低。我们发现，这种减少是由于银河系外 UHECR 通量峰值的位置与由于银河系中心区域的 GMF 导致的强通量去聚合的边界意外重合。UHECR 各向异性对 GMF 模型的这种偶然敏感性将成为对源分布以及银河系和星系外磁场的有力探测。GMF 的 DEAGNATION 也会影响一些受欢迎的来源候选者的可见性。